Jonesboro is a city located in Union County Illinois. It is also the county seat of Union County. With a 2020 population of 1,666, it is the 520th largest city in Illinois and the 8313th largest city in the United States . Jonesboro is currently declining at a rate of -1.01% annually and its population has decreased by -8.51% since the most recent census, which recorded a population of 1,821 in 2010. Jonesboro reached it's highest population of in . Spanning over 3 miles, Jonesboro has a population density of 617 people per square mile.
The average household income in Jonesboro is $60,786 with a poverty rate of 22.42%. The median rental costs in recent years comes to $567 per month, and the median house value is $83,600. The median age in Jonesboro is 39.6 years, 39.2 years for males, and 40.5 years for females.